Sound radiator



C. R. MOORE 50mm RADIATOR Filed June 15, 1923 Patented Nov. 6, 1928.

UNITED s 'r'A-T'Es rarsnrorrica.

manna n. moon, or iaarmwoon, :mw .mnsmr, assronoa 'ro w'ssramr smomo comm, moonrom'mn, or NEW YORK, 11. Y., A CORPORATION or mzw TORI.

SOUND RADIATOR.

Application filed June 15, 102$. Serial iio. 845,818

This invention relates to radiators and has for an object to provide a sound radiator which is simple in form and easy to manufacture. This is accomplished by providing a a sound radiator, for instance, wh ch is adapted to serve as a loud speaker in the. form of a sheet of thin stiff material such as pa )er, which may if desired. be coded up. Reierring to the drawings, Fig. 1 1s a plan in view of a sound radiator with an electric drive, therefor, and Fig. 2 is a side elevation of Fig. 1. 1

Referring in detail to" Fig. 1, the electromagnetic drive 1 may be of the form'shown 1 and deieribed in detail in Egerton Patent 1,3(35 898,'.lanuary 18, 1921. This drive is suitably supported on a base 2 whichcarries two upright posts 3 and 4 which support bars 5 and 6. These bars, by means of bolts .2 7, serve to clamp one edge of the sound radiator 8 which is coiled up, and another edge of which is suitably fastened to the driving element 9 of the electric motor, for instance, by a bolt 10. The lateral edges of the sheet or diaphragm are unsupported and are free to vibrate. .lllectric currents received by the motor 1 vibrate the diaphragm 8 which gives oil corresponding sound waves. \Vhat is claimed is:

L'In combination, a sound radiator comprising a sheet of paper coiled in substantialy spiral form, said spiral having an axial dimension greater than its diameter, means for holding the inner edge of the spiral stationary, and means for imparting vibrations representing sound to said sheet near the outer end of the spiral.

2. In combination :1 direct acting loud 40 speaking sound reproducer for speech and music comprising a sheet of a plurality of turns of thin flexible material substantially in; spiral form. and means for imparting longitudinal vibrations thereto at one edge 4 thereon :shaped diap of 'convolutions, driving means for imparting longitudinal vibrations theretoat the outer end of the said diaphragm and sup-- porting means attached along the inner edge of the spiral diaphragm. 5. A dinect acting sound reproducer for speech and music comprising a spiral shaped s eet of thin stiff material having its axial dimension greater than its diameter, and means for impressing longitudinal vibrations representing sound to a free edge of the sheet at one end of the spiral in the irection of the. surface of the sheet at the place where the vibrations are applied.

6. A loud speaker comprisin a sheet like sound radiator, 11 base member aving means .for rigidly holding'one edge .of said radiator staticnary'with respect to said base, and a driving means for said radiator mounted on said .base and connected to another edge of said radiator. v

7. A direct acting sound reproducer comprising a curved sheet like diaphragm, a base member, means mounted on one portion thereof for rigidly holding one edge of said diaphragm, and means mounted on another portion of said base for driving said diaphragm at'anothcr of its edges. the vibrational forces imparted by said driving means being applied in the direction of the surface of the diaphragm at the point of attachment of the driving means.

edge at the inner end In witness whereof, I hereunto subscribe my name this 7th day of June A. D., 1923. i

CHARLES R. Moons. 

